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Finding the Fourth Proportional to 78,079.80, 117,120 and 18,915.36

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Solution

The fourth proportional to 78,079.80, 117,120 and 18,915.36 is: 28,373.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,079.80 : 117,120 = 18,915.36 : x
  2. Step 2: Convert to fraction form
    78,079.80/117,120 = 18,915.36/x
  3. Step 3: Cross multiply
    78,079.80x = 117,120 × 18,915.36
  4. Step 4: Simplify right side
    78,079.80x = 2,215,366,963.20
  5. Step 5: Solve for x
    x = 2,215,366,963.20/78,079.80
  6. Step 6: Final answer
    x = 28,373.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.